US4796709A - Milling tool for cutting well casing - Google Patents

Milling tool for cutting well casing Download PDF

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Publication number
US4796709A
US4796709A US06/816,287 US81628786A US4796709A US 4796709 A US4796709 A US 4796709A US 81628786 A US81628786 A US 81628786A US 4796709 A US4796709 A US 4796709A
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US
United States
Prior art keywords
cutting
casing
blades
cutting elements
generally
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/816,287
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English (en)
Inventor
Gerald D. Lynde
Kenneth W. Winterrowd
Harold H. Harvey, Jr.
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Baker Hughes Holdings LLC
Original Assignee
Tri State Oil Tools Inc
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Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25220180&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US4796709(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Tri State Oil Tools Inc filed Critical Tri State Oil Tools Inc
Assigned to TRI-STATE OIL TOOL INDUSTRIES, INC. reassignment TRI-STATE OIL TOOL INDUSTRIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HARVEY, HAROLD H. JR., LYNDE, GERALD D., WINTERROWD, KENNETH W.
Priority to US06/816,287 priority Critical patent/US4796709A/en
Priority to GB8614488A priority patent/GB2184963B/en
Priority to US07/927,512 priority patent/US4887668A/en
Priority to EP87300020A priority patent/EP0231989A3/fr
Priority to NO870032A priority patent/NO177197B/no
Priority to CA000526679A priority patent/CA1325545C/fr
Priority to AU67126/87A priority patent/AU590374B2/en
Priority to US07/169,836 priority patent/US5014778A/en
Priority to US07/181,812 priority patent/US4978260A/en
Priority to US07/272,466 priority patent/US4938291A/en
Publication of US4796709A publication Critical patent/US4796709A/en
Application granted granted Critical
Priority to US07/512,973 priority patent/US4984488A/en
Assigned to BAKER HUGHES INCORPORATED, A DE CORP. reassignment BAKER HUGHES INCORPORATED, A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: TRI-STATE OIL TOOLS, INC.
Assigned to TRI-STATE OIL TOOLS, INC., A CORP. OF CA. reassignment TRI-STATE OIL TOOLS, INC., A CORP. OF CA. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BAKER HUGHES INCORPORATED, A CORP. OF DE.
Priority to SG810/90A priority patent/SG81090G/en
Priority to US07/673,186 priority patent/US5086838A/en
Priority to US07/680,702 priority patent/US5150755A/en
Assigned to BAKER HUGHES INCORPORATED, A DELAWARE CORPORATION reassignment BAKER HUGHES INCORPORATED, A DELAWARE CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: TRI STATE OIL TOOLS, INC., A CORP. OF CA
Priority to US07/948,362 priority patent/US5297630A/en
Priority to US08/323,815 priority patent/US5456312A/en
Priority to US08/541,551 priority patent/US5810079A/en
Priority to US08/958,829 priority patent/US5899268A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • E21B29/002—Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B5/00—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor
    • B23B5/16—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor for bevelling, chamfering, or deburring the ends of bars or tubes
    • B23B5/167—Tools for chamfering the ends of bars or tubes
    • B23B5/168—Tools for chamfering the ends of bars or tubes with guiding devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/55—Cutting by use of rotating axially moving tool with work-engaging structure other than Tool or tool-support
    • Y10T408/557—Frictionally engaging sides of opening in work
    • Y10T408/558—Opening coaxial with Tool
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/78—Tool of specific diverse material

Definitions

  • This invention relates generally to a cutting tool for cutting tubular members, such as pipe, casing, casing liners, or tubing, previously installed within a well, and more particularly, to such a milling or cutting tool which is inserted within a well for removing a predetermined length or section of a tubular member from the well.
  • various types of milling or cutting tools have been provided for cutting or milling existing pipe or casing previously installed in a well.
  • Such tools normally have cutting blades on their lower ends and are lowered within the well or casing to be cut and then rotated in a cutting operation.
  • a suitable drilling fluid is normally pumped down a central bore of the cutting tool for discharge beneath the cutting blades and an upward flow of the discharged fluid in the annulus outside the cutting tool removes the cuttings or chips resulting from the cutting operation from the well.
  • Milling tools for removing a section of existing casing or the like from a well bore have been provided heretofore. Sections of casings are removed for various purposes, such as, for example, to permit a sidetracking operation in directional drilling, to provide a perforated production zone at a desired level, to provide cement bonding between a small diameter casing and the adjacent formation, or to remove a loose joint of surface pipe. Also, milling tools are used for milling or reaming collapsed casing, for removing burrs or other imperfections from windows in the casing system, for placing whipstocks in directional drilling, or for aiding in correcting dented or mashed-in areas of casing or the like.
  • a common milling tool has a plurality of blades spaced about the outer surface of the tool with the lower surfaces of the blades engaging the upper circular end surface of the pipe or casing in a cutting operation to chip or cut away progressively the end of the casing.
  • Each blade takes a bite or cut from the upper end of the casing during rotation of the milling tool.
  • the rate of penetration or cutting away of the casing is normally dependent on several factors, such as, for example, the rotational speed of the tool, the amount of weight on the tool, the number and type of blades, and the rate at which the chips or cuttings are removed from the well. Normal penetration rates heretofore have been around eight (8) to eleven (11) feet per hour and blades have required replacement after removal of around one hundred feet of casing. Also, long turnings over around six inches in length that tend to curl and internest with each other have been provided heretofore.
  • a critical factor in obtaining a high rate of penetration is in the removal of the metal scrap material and oftentimes the limiting factor to the cutting operation is the rate of removal of the metal scrap material. Long turnings or shavings tend to restrict, at times, such removal rates.
  • the present invention is particularly directed to a cutting tool adapted to be lowered within an outer well casing for cutting, grinding, or chipping a section or length of an existing casing previously installed in the well.
  • casing shall be interpreted to include pipe, casing, tubing, liners, and other similar tubular members installed within a well.
  • the milling tool of the present invention comprises a plurality of improved cutting blades closely spaced from each other between around one inch and three inches about the outer periphery of a generally cylindrical tool body.
  • Each blade is generally identical and has an elongate leading planar surface inclined rearwardly from its upper end with respect to the axis of rotation and a lower cutting surface in cutting contact with and biting into the upper circular end of the casing to be removed.
  • the inclination of the leading planar surface results in a dragging or pulling of the lower cutting edge across the upper annular end surface of the casing being cut away to provide an improved smooth cutting action which also results in the formation of relatively short length turnings or chips having a length less than six inches thereby to permit the easy removal of the scrap metal from the well by drilling fluid.
  • each blade is defined by a plurality of metal carbide cutting elements secured to the base of the blade, and in the embodiment shown includes a plurality of metal carbide cylindrical discs arranged in adjacent generally horizontal rows, each row having at least two carbide discs therein and being staggered with respect to adjacent rows.
  • the hard carbide discs are secured such as by brazing to the base or body of the blade and from the lower cutting edge which digs or bites into the upper end of the casing to be removed.
  • the carbide cutting elements and the supporting base of the blade wear away from the lower end of the blade as the cutting operation continues.
  • the thickness of the blade body supporting the carbide cutting elements is around twice the thickness of the discs and is formed of a mild steel material preferably around seven times softer than the metal carbide discs so that any drag from the wear flat formed by the blade body contacting the upper end of the casing is minimized.
  • the lower cutting surface of the blade has a so-called negative rake formed by the rearward inclination of the leading face of the blade with respect to the axis of rotation and this results in a pulling or dragging of the cutting edge across the surface for the improved cutting action in combination with a maximum number of blades as can be accommodated while permitting the efficient and effective removal of the metal cuttings or turnings formed in the cutting action, and a depth of cut or bite taken by each blade of between around 0.002 inch to 0.005 inch to form a short length of metal cutting which restricts curling or rolling up and thereby is easy to remove from the well. It has been found that a surface speed of each blade along the uppermost end of the casing of an optimum of around three hundred to three hundred and fifty feet per minute provides the most effective cutting action with the present invention.
  • the blade length determines its life and with a twelve inch blade on which the carbide discs are secured, around two hundred feet of casing may be cut before the blades require replacement.
  • Such a long life blade minimizes the number of trips for the milling tool required for replacement of blades.
  • the present invention has had rates of penetration of from thirty to forty-five feet per hour which is three to four times greater than the rate of penetration heretofore. This has been obtained by the use of the novel blades comprising the present invention.
  • the milling tool of the present invention when using the milling tool of the present invention to remove an inner casing having an outside diameter of nine and 5/8ths inches with twelve blades positioned at intervals of thirty degrees (30°) about the circumference of the cylindrical tool body and operated at a surface speed of around three hundred and fifty feet per minute along the upper end surface of the casing with a bite of around 0.004 inch, a weight of around 12,000 pounds, and a torque of between 2,500 foot pounds and 3,000 foot pounds, a penetration rate of between thirty and forty feet in one hour was obtained.
  • Such an increased rate of penetration has been unexpected and surprising as compared with the rates of penetration heretofore with somewhat similar types of milling tools as shown by the prior art.
  • An additional object is to provide such improved blades having a plurality of hard carbide cutting elements thereon defining the leading planar surfaces of the blades and the cutting edges, with the body of the blades on which the cutting elements are mounted being of a thickness of around twice the thickness of the cutting elements and formed of a material around seven times softer than the carbide cutting elements thereby to minimize frictional contact of the blades with the upper end of the casing.
  • Another object of this invention is to provide such a milling tool having a maximum number of blades equally spaced at intervals between one inch and three inches about the periphery of the tool with each blade taking a bite of between 0.002 and 0.005 inch from the end of the casing and providing relatively short length metal chips or turnings thereby to permit an effective removal of the metal scrap material from the well.
  • FIG. 1A is a longitudinal section of a prior art milling tool for progressively cutting away the upper end of an inner well casing for removing a predetermined section or length of casing from the well;
  • FIG. 1B is an enlarged fragment of the prior art milling tool shown in FIG. 1A showing the cutting action resulting from a prior art blade in alignment with the axis of rotation;
  • FIG. 1 is a longitudinal section of the present milling tool comprising the present invention having the improved blades thereon for cutting into the upper annular end of an inner casing installed within a well for removal of a section of the inner casing;
  • FIG. 2 is a section taken generally along the line 2--2 of FIG. 1 and showing the arrangement of the cutting blades about the cylindrical body of the milling tool shown in FIG. 1;
  • FIG. 3 is a section taken generally along line 3--3 of FIG. 1 and showing the improved cutting blades of the milling tool;
  • FIG. 4 is a perspective of the milling tool of FIGS. 1-3 showing the lower cutting surface of the cutting blades biting into and engaging the upper annular end of the inner casing to strip or cut away in a plurality of a generally uniform size metal cuttings a predetermined section of casing;
  • FIG. 5 is an enlarged fragment of FIG. 1 illustrating one blade with hard carbide cutting elements secured to and forming the leading face thereof;
  • FIG. 6 is an enlarged side elevation of the blade looking generally along line 6--6 of FIG. 5 and showing the lower cutting edge of the blade engaging the upper end of the inner casing in a cutting operation.
  • FIGS. 1A and 1B in which an example of a prior art milling tool T is illustrated, a plurality of blades B are spaced about the outer periphery of tool T. Blades B have lower cutting edges E for contacting and engaging in cutting relation the upper annular end of an inner casing IC installed within an outer casing OC of a well. Blades B progressively cut away a predetermined section of the inner casing including joints J between casing lengths which are normally around thirty feet.
  • Blades B are welded onto the outer periphery of the cylindrical body of milling tool T and extend in a vertical direction parallel to the longitudinal rotational axis of milling tool T.
  • the front leading faces of blades B have carbide cutting chips secured thereon which provide a cutting surface and as shown in FIG. 1B the lower cutting edge E of blade B extends at a right angle to the front face of blade B and rides along the annular end surface of inner casing IC to provide a plurality of metal turnings or chips C in various shapes and sizes.
  • the relatively wide variation in the sizing of the metal turnings or metal chips C may range from around 0.001 inch to 0.020 inch in thickness with a substantial amount of long length turnings over six inches as a result of the relatively rough rotary movement resulting from contact of the lower surfaces of blades B with the upper end of inner casing IC.
  • metal chips or cuttings particularly the long length curled or rolled up shavings, sometimes such metal shavings will intertwine or internest in a mass which will restrict the removal of the metal turnings by the drilling fluid being discharged from the lower end of milling tool T through a central bore.
  • a milling tool comprising the present invention is illustrated generally at 10 and is adapted for cutting or milling away the annular end 12 of inner casing 14 and associated coupling 15 which are positioned within outer casing 16 of a well.
  • Milling tool 10 is supported from the surface for rotation by suitable power means, as well known, which is also adapted to apply a predetermined loading on tool 10.
  • Milling tool 10 has a cylindrical lower body portion 18 which defines an outer peripheral surface 20.
  • the lower end portion of body portion 18 forms a stabilizer and stabilizer ribs 22 thereon are spaced slightly from the inner peripheral surface of inner casing 14 for positioning milling tool 10 accurately within inner casing 14.
  • Tapered end 24 guides tool 10 within the upper end of casing 14.
  • Milling tool 10 has a central bore 26 therein which is adapted to receive drilling fluid pumped from the surface for discharge from the end of tool 10 at 28.
  • the discharged drilling fluid removes the metal cuttings, chips, shavings, or metal scrap material resulting from the cutting operation from the annulus 30 outside milling tool 10.
  • a relatively small clearance such as around 1/16th inch, is provided between stabilizer ribs 22 of tool 10 and the inner periphery of inner casing 14 so that a minimum lateral movement of tool 10 is provided upon rotation thereof.
  • the blade design of this invention comprises a plurality of generally identical blades indicated at 32 and utilizing as many blades as can be feasibly positioned about outer periphery 20 of cylindrical body 18 while providing adequate spacing for an effective removal of the metal cuttings or turnings from annulus 30 by drilling fluid.
  • a spacing S as shown in FIG. 3 between blades 32 along periphery 20 of at least around one inch is believed necessary in order to provide adequate space to remove satisfactorily the metal cuttings and scrap material, and preferably a spacing S of around two inches.
  • Such a spacing S may be as much as around three inches under some operating conditions and provide effective results.
  • a spacing S between blades 32 at peripheral surface 20 of between one inch and three inches provides best results.
  • a milling tool 10 utilized for removal of casing 14 having an OD of nine and 5/8ths inches the use of twelve blades 32 arranged at thirty degrees (30°) to each other about surface 20 has been found to obtain best results.
  • FIGS. 2-4 show tool 10 with twelve blades 32 thereon, while FIG. 1, for purposes of illustration, has only three blades illustrated with the remaining blades omitted. It is to be understood, however, that tool 10 of FIG. 1 would have twelve blades 32 thereabout.
  • Each blade 32 has a leading planar face or surface 34, an opposed trailing planar face or surface 36, and a lower cutting and wear surface 38 positioned between and at right angles between surfaces 34 and 36 prior to use of blades 32.
  • Lower surface 38 is in contact with and rides along the upper annular end 12 of inner casing 14 which is being cut and removed during the cutting operation.
  • a suitable backup or support rod indicated at 40 is positioned at the juncture of trailing surface 36 with peripheral surface 20, and welded in position as shown in FIG. 2 with the elongate blades 32 extending at an angle A shown in FIG. 1 with respect to the vertical rotational axis of milling tool 10 which is an optimum of five degrees (5°), for example.
  • An optimum range for angle A is between around three degrees (3°) and fifteen degrees (15°), but it is believed that under certain conditions angle A between around two degrees (2°) and twenty degrees (20°) would function satisfactorily.
  • leading face 34 is inclined or slanted rearwardly from its upper end to its lower end in respect to the axis of rotation and this provides a negative rake shown by angle B to the cutting edge 39 of lower surface 38 thereby to permit cutting edge 39 to be pulled across and along end surface 12 in cutting relation for providing a highly effective smooth cutting action.
  • lower surface 38 is perpendicular to leading face 34 and angle B shown in FIG. 1 is the same as angle A.
  • a horizontal wear flat surface is formed after use of blades 32 as shown in FIG. 6.
  • Leading face 34 is defined by a plurality of hard carbide cutting elements preferably comprising a plurality of cylindrical carbide discs or buttons 42 secured by suitable brazing or the like to the planar face of base 43 of blade 32.
  • Discs 42 are preferably arranged in a plurality of generally horizontal staggered rows of four and five discs and in a plurality of generally vertical staggered columns as illustrated generally in FIG. 1.
  • a disc 42 which has been found to function in a satisfactory manner has a thickness of 3/16ths inch, a diameter of 5/8ths inch, and is sold under the same Sandvik S6 by The Sandvik Company, located in Houston, Texas.
  • Each cylndrical disc 42 has a front face 42A which forms a portion of the surface area of leading face 34, an opposed rear face 42B flush with base 43, a front outer cutting edge 42C about front face 42A forming cutting edge 39 of lower surface 38 that bites or digs into the upper annular surface 12 of casing 14 as shown in FIG. 6 and annular surface or face 42D about disc 42 between faces 42A and 42B.
  • the lower portion of arcuate cutting edge 42C for the lower half of disc 42 includes a lowermost intermediate portion and opposed side portions inclined upwardly from the intermediate portion.
  • Front faces 42A of discs 42 extend in a plane which defines leading face 34 and at angle A with respect to the axis of rotation thereby to provide a negative rake for face 42D forming cutting edge 39.
  • Front face 42A may be provided, if desired, with a depressed area of recess therein receiving metal turning of chip 44 to aid in breakage of the chip 44 thereby to form a chip breaker.
  • lower surface 38 becomes a flat horizontal surface as shown in FIG. 6 formed by the horizontal wear flat surface on lower edge portion 47 of blade base 43 and the lowermost horizontal portion of surface 42D.
  • initial horizontal wear flat surface 38 is formed as shown in FIG. 5 by the lowermost row of discs 42 and base 43, successive wear along the length of blades 32 is along a horizontal plane as shown in FIG. 6.
  • the cutting surfaces formed by discs 42 are the cutting edge 42C and the portions of faces 42A and 42D immediately adjacent cutting edge 42C.
  • a suitable depth of cut or bite taken from end surface 12 as shown at D in FIG. 6 is around 0.004 inch.
  • metal turnings 44 have been found to have a generally short length between around three and five inches.
  • a chip breaker such as provided by a depression in face 42C of discs 42, to aid in the breaking away of relatively short chips 44 thereby to permit easy removal of the scrap material formed by metal turnings 44 from the well by drilling fluid.
  • the rate of removal of the metal scrap material is important to have a metal turning 44 of a short length so that it does not curl and intermesh with other turnings to form a large mass of scrap material.
  • a metal turning 44 having a thickness between 0.002 inch and 0.005 inch in thickness and a length between three and five inches, at least for a substantial majority of all scrap metal material, a highly effective removal of the metal cuttings is obtained with a corresponding high rate of penetration for milling tool 10.
  • base 43 should have an optimum thickness T1 as indicated in FIG. 6 twice the thickness T2 of disc 42 in order to provide adequate strength and yet not exert a relatively large drag to the cutting operation.
  • a thickness T1 between one and three times thickness T2 has been found to function satisfactorily.
  • the thickness T1 of blade base 43 may be, for example, around 3/8ths of an inch when the thickness T2 of discs 42 is 3/16ths of an inch on a ratio of two to one.
  • the material from which base 43 is formed is of a mild steel having a Brinell hardness range of around 145 with an optimum Brinell hardness range of around 130 and 160.
  • the carbide discs 42 have a Rockwell A hardness of around eighty-five to eighty-eight which is around seven to nine times harder than the material from which blade 32 is formed. For satisfactory results, it is believed that discs 32 should be at least around four times harder than base 43.
  • Casing 14 has a Brinnell hardness of around two hundred and carbide discs 42 are around five times harder than casing 14.
  • base 43 being formed of a material several times as soft as carbide discs 42, the wear flat surface at 47 is easily worn away with a minimum of friction thereby providing a minimum of heat and a minimum torque required for rotation of milling tool 10, as is desirable.
  • the depth of cut D shown in FIG. 6 is selected in order to obtain a maximum rate of penetration with a large number of blades with each blade obtaining the same cutting depth or bite D. Further, it is desirable to obtain a relatively short metal shaving or cutting 44 which does not tend to intertwine with other shavings and provide an internesting mass which might restrict the removal of such metal scrap.
  • the inclination of face 42A in contact with the metal turnings 44 particularly if formed with a depression therein, assists in the breaking of metal turnings 44 at a relatively short length of three to five inches, for example, and since a substantial thickness of shavings 44 is provided, the curling or turning up of the ends of the shavings is restricted.
  • the rotational speed of milling tool 10 is designed to provide a surface speed of blades 32 along the upper annular surface 12 of casing 14 at an optimum of around three hundred (300) to three hundred and fifty (350) feet per minute in order to obtain an optimum cutting depth for each blade of around 0.004 inch.
  • a torque of around 2500 to 3000 foot pounds has been found to be satisfactory for rotation of milling tool 10.
  • a surface speed of between two hundred (200) and four hundred and fifty (450) feet per minute along surface 12 is believed to operate satisfactorily under certain conditions.
  • a penetration rate of from thirty to fotry-five feet per hour has been obtained which is three or four times greater than the rate of penetration heretofore.
  • Blades 42 are worn away progressively with each row of discs 42 being successively worn away in a continuous cutting operation. For a blade around twelve inches in length, a casing section or length around two hundred (200) feet may be cut. Thus, milling tool 10 would not be required to be removed from the well for replacement of blades 32 until the removal of around two hundred (200) feet of casing 14, for example.
  • the blade design of the present invention cuts away a length of casing around fifteen to twenty feet in length upon each inch of wear on blade 32.
  • milling tool 10 comprising the present invention and utilizing an improved blade design has been provided which increases the rate of penetration or rate of cutting away a section of casing within an existing well to an amount that is three or four times greater than heretofore.
  • an improved blade design which results in an effective and fast removal rate of the metal scrap material from the well under the operational characteristics set forth, a highly improved result has been obtained.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
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  • Earth Drilling (AREA)
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US06/816,287 1986-01-06 1986-01-06 Milling tool for cutting well casing Expired - Lifetime US4796709A (en)

Priority Applications (18)

Application Number Priority Date Filing Date Title
US06/816,287 US4796709A (en) 1986-01-06 1986-01-06 Milling tool for cutting well casing
GB8614488A GB2184963B (en) 1986-01-06 1986-06-13 Milling tool for cutting well casing
US07/927,512 US4887668A (en) 1986-01-06 1986-11-06 Cutting tool for cutting well casing
AU67126/87A AU590374B2 (en) 1986-01-06 1987-01-05 Milling tool for cutting well casing
CA000526679A CA1325545C (fr) 1986-01-06 1987-01-05 Fraise servant a couper des tubages de puits
NO870032A NO177197B (no) 1986-01-06 1987-01-05 Freseverktöy for avskjæring av foringsrör
EP87300020A EP0231989A3 (fr) 1986-01-06 1987-01-05 Outil de fraisage pour couper un tubage de puits
US07/169,836 US5014778A (en) 1986-01-06 1988-03-18 Milling tool for cutting well casing
US07/181,812 US4978260A (en) 1986-01-06 1988-04-15 Cutting tool for removing materials from well bore
US07/272,466 US4938291A (en) 1986-01-06 1988-11-17 Cutting tool for cutting well casing
US07/512,973 US4984488A (en) 1986-01-06 1990-04-23 Method of securing cutting elements on cutting tool blade
SG810/90A SG81090G (en) 1986-01-06 1990-10-04 Milling tool for cutting well casing
US07/673,186 US5086838A (en) 1986-01-06 1991-03-21 Tapered cutting tool for reaming tubular members in well bore
US07/680,702 US5150755A (en) 1986-01-06 1991-04-04 Milling tool and method for milling multiple casing strings
US07/948,362 US5297630A (en) 1986-01-06 1992-09-21 Downhole milling tool
US08/323,815 US5456312A (en) 1986-01-06 1994-10-17 Downhole milling tool
US08/541,551 US5810079A (en) 1986-01-06 1995-10-10 Downhole milling tool
US08/958,829 US5899268A (en) 1986-01-06 1997-10-28 Downhole milling tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/816,287 US4796709A (en) 1986-01-06 1986-01-06 Milling tool for cutting well casing

Related Child Applications (3)

Application Number Title Priority Date Filing Date
US07/927,512 Continuation-In-Part US4887668A (en) 1986-01-06 1986-11-06 Cutting tool for cutting well casing
US07/169,836 Continuation US5014778A (en) 1986-01-06 1988-03-18 Milling tool for cutting well casing
US07/181,812 Continuation-In-Part US4978260A (en) 1986-01-06 1988-04-15 Cutting tool for removing materials from well bore

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US4796709A true US4796709A (en) 1989-01-10

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US06/816,287 Expired - Lifetime US4796709A (en) 1986-01-06 1986-01-06 Milling tool for cutting well casing

Country Status (7)

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US (1) US4796709A (fr)
EP (1) EP0231989A3 (fr)
AU (1) AU590374B2 (fr)
CA (1) CA1325545C (fr)
GB (1) GB2184963B (fr)
NO (1) NO177197B (fr)
SG (1) SG81090G (fr)

Cited By (59)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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US5014778A (en) * 1986-01-06 1991-05-14 Tri-State Oil Tools, Inc. Milling tool for cutting well casing
US5027914A (en) * 1990-06-04 1991-07-02 Wilson Steve B Pilot casing mill
US5035293A (en) * 1990-09-12 1991-07-30 Rives Allen K Blade or member to drill or enlarge a bore in the earth and method of forming
EP0480656A1 (fr) * 1990-10-10 1992-04-15 Weatherford U.S., Inc. Outil à fraiser
US5150755A (en) * 1986-01-06 1992-09-29 Baker Hughes Incorporated Milling tool and method for milling multiple casing strings
US5626189A (en) * 1995-09-22 1997-05-06 Weatherford U.S., Inc. Wellbore milling tools and inserts
US5636692A (en) * 1995-12-11 1997-06-10 Weatherford Enterra U.S., Inc. Casing window formation
US5642787A (en) * 1995-09-22 1997-07-01 Weatherford U.S., Inc. Section milling
US5709265A (en) * 1995-12-11 1998-01-20 Weatherford/Lamb, Inc. Wellbore window formation
US5720349A (en) * 1995-10-12 1998-02-24 Weatherford U.S., Inc. Starting mill and operations
US5727629A (en) * 1996-01-24 1998-03-17 Weatherford/Lamb, Inc. Wellbore milling guide and method
US5730221A (en) * 1996-07-15 1998-03-24 Halliburton Energy Services, Inc Methods of completing a subterranean well
US5735359A (en) * 1996-06-10 1998-04-07 Weatherford/Lamb, Inc. Wellbore cutting tool
US5787978A (en) * 1995-03-31 1998-08-04 Weatherford/Lamb, Inc. Multi-face whipstock with sacrificial face element
US5791417A (en) * 1995-09-22 1998-08-11 Weatherford/Lamb, Inc. Tubular window formation
US5803176A (en) * 1996-01-24 1998-09-08 Weatherford/Lamb, Inc. Sidetracking operations
US5806595A (en) * 1993-09-10 1998-09-15 Weatherford/Lamb, Inc. Wellbore milling system and method
US5813465A (en) * 1996-07-15 1998-09-29 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US5826651A (en) * 1993-09-10 1998-10-27 Weatherford/Lamb, Inc. Wellbore single trip milling
US5829524A (en) * 1996-05-07 1998-11-03 Baker Hughes Incorporated High pressure casing patch
US5833003A (en) * 1996-07-15 1998-11-10 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US5836387A (en) * 1993-09-10 1998-11-17 Weatherford/Lamb, Inc. System for securing an item in a tubular channel in a wellbore
US5862862A (en) * 1996-07-15 1999-01-26 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US5862870A (en) * 1995-09-22 1999-01-26 Weatherford/Lamb, Inc. Wellbore section milling
US5887668A (en) * 1993-09-10 1999-03-30 Weatherford/Lamb, Inc. Wellbore milling-- drilling
US5887655A (en) * 1993-09-10 1999-03-30 Weatherford/Lamb, Inc Wellbore milling and drilling
US5908071A (en) * 1995-09-22 1999-06-01 Weatherford/Lamb, Inc. Wellbore mills and inserts
US5984005A (en) * 1995-09-22 1999-11-16 Weatherford/Lamb, Inc. Wellbore milling inserts and mills
US6021850A (en) * 1997-10-03 2000-02-08 Baker Hughes Incorporated Downhole pipe expansion apparatus and method
US6024168A (en) * 1996-01-24 2000-02-15 Weatherford/Lamb, Inc. Wellborne mills & methods
US6029748A (en) * 1997-10-03 2000-02-29 Baker Hughes Incorporated Method and apparatus for top to bottom expansion of tubulars
US6032740A (en) * 1998-01-23 2000-03-07 Weatherford/Lamb, Inc. Hook mill systems
US6056056A (en) * 1995-03-31 2000-05-02 Durst; Douglas G. Whipstock mill
US6059037A (en) * 1996-07-15 2000-05-09 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US6070665A (en) * 1996-05-02 2000-06-06 Weatherford/Lamb, Inc. Wellbore milling
US6073692A (en) * 1998-03-27 2000-06-13 Baker Hughes Incorporated Expanding mandrel inflatable packer
US6076602A (en) * 1996-07-15 2000-06-20 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US6092601A (en) * 1996-07-15 2000-07-25 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US6116344A (en) * 1996-07-15 2000-09-12 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US6135206A (en) * 1996-07-15 2000-10-24 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US6155349A (en) * 1996-05-02 2000-12-05 Weatherford/Lamb, Inc. Flexible wellbore mill
US6170576B1 (en) 1995-09-22 2001-01-09 Weatherford/Lamb, Inc. Mills for wellbore operations
US6202752B1 (en) 1993-09-10 2001-03-20 Weatherford/Lamb, Inc. Wellbore milling methods
US6374918B2 (en) 1999-05-14 2002-04-23 Weatherford/Lamb, Inc. In-tubing wellbore sidetracking operations
US6446724B2 (en) 1999-05-20 2002-09-10 Baker Hughes Incorporated Hanging liners by pipe expansion
US6547006B1 (en) 1996-05-02 2003-04-15 Weatherford/Lamb, Inc. Wellbore liner system
US20110031035A1 (en) * 2009-08-07 2011-02-10 Stowe Ii Calvin J Cutter and Cutting Tool Incorporating the Same
US20120051863A1 (en) * 2010-08-25 2012-03-01 Kennametal Inc. Combination end milling/drilling/reaming cutting tool
US8327957B2 (en) 2010-06-24 2012-12-11 Baker Hughes Incorporated Downhole cutting tool having center beveled mill blade
US8434572B2 (en) 2010-06-24 2013-05-07 Baker Hughes Incorporated Cutting elements for downhole cutting tools
US8555955B2 (en) 2010-12-21 2013-10-15 Baker Hughes Incorporated One trip multiple string section milling of subterranean tubulars
US8936109B2 (en) 2010-06-24 2015-01-20 Baker Hughes Incorporated Cutting elements for cutting tools
US8985246B2 (en) 2010-09-28 2015-03-24 Baker Hughes Incorporated Subterranean cutting tool structure tailored to intended use
WO2015094659A1 (fr) * 2013-12-16 2015-06-25 Schlumberger Canada Limited Éléments de coupe pour fraisage de cuvelage
US9151120B2 (en) 2012-06-04 2015-10-06 Baker Hughes Incorporated Face stabilized downhole cutting tool
CN113305524A (zh) * 2021-06-22 2021-08-27 锐胜精机（深圳）有限公司 刀具及其制作方法
CN115582675A (zh) * 2022-09-28 2023-01-10 沈阳黎明航空零部件制造有限公司 一种作动筒后盖内腔的加工方法
US20230182218A1 (en) * 2020-06-22 2023-06-15 Sumitomo Electric Hardmetal Corp. Cutting tool

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Cited By (75)

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Publication number Priority date Publication date Assignee Title
US4978260A (en) * 1986-01-06 1990-12-18 Tri-State Oil Tools, Inc. Cutting tool for removing materials from well bore
US5014778A (en) * 1986-01-06 1991-05-14 Tri-State Oil Tools, Inc. Milling tool for cutting well casing
US5150755A (en) * 1986-01-06 1992-09-29 Baker Hughes Incorporated Milling tool and method for milling multiple casing strings
US5297630A (en) * 1986-01-06 1994-03-29 Baker Hughes Incorporated Downhole milling tool
US5058666A (en) * 1988-04-15 1991-10-22 Tri-State Oil Tools, Inc. Cutting tool for removing materials from well bore
US5027914A (en) * 1990-06-04 1991-07-02 Wilson Steve B Pilot casing mill
US5035293A (en) * 1990-09-12 1991-07-30 Rives Allen K Blade or member to drill or enlarge a bore in the earth and method of forming
EP0480656A1 (fr) * 1990-10-10 1992-04-15 Weatherford U.S., Inc. Outil à fraiser
US5887655A (en) * 1993-09-10 1999-03-30 Weatherford/Lamb, Inc Wellbore milling and drilling
US5887668A (en) * 1993-09-10 1999-03-30 Weatherford/Lamb, Inc. Wellbore milling-- drilling
US5836387A (en) * 1993-09-10 1998-11-17 Weatherford/Lamb, Inc. System for securing an item in a tubular channel in a wellbore
US6035939A (en) * 1993-09-10 2000-03-14 Weatherford/Lamb, Inc. Wellbore anchor system
US5826651A (en) * 1993-09-10 1998-10-27 Weatherford/Lamb, Inc. Wellbore single trip milling
US6202752B1 (en) 1993-09-10 2001-03-20 Weatherford/Lamb, Inc. Wellbore milling methods
US5806595A (en) * 1993-09-10 1998-09-15 Weatherford/Lamb, Inc. Wellbore milling system and method
US5787978A (en) * 1995-03-31 1998-08-04 Weatherford/Lamb, Inc. Multi-face whipstock with sacrificial face element
US6056056A (en) * 1995-03-31 2000-05-02 Durst; Douglas G. Whipstock mill
US5626189A (en) * 1995-09-22 1997-05-06 Weatherford U.S., Inc. Wellbore milling tools and inserts
US5862870A (en) * 1995-09-22 1999-01-26 Weatherford/Lamb, Inc. Wellbore section milling
US5984005A (en) * 1995-09-22 1999-11-16 Weatherford/Lamb, Inc. Wellbore milling inserts and mills
US5908071A (en) * 1995-09-22 1999-06-01 Weatherford/Lamb, Inc. Wellbore mills and inserts
US6170576B1 (en) 1995-09-22 2001-01-09 Weatherford/Lamb, Inc. Mills for wellbore operations
US5791417A (en) * 1995-09-22 1998-08-11 Weatherford/Lamb, Inc. Tubular window formation
US5642787A (en) * 1995-09-22 1997-07-01 Weatherford U.S., Inc. Section milling
US5720349A (en) * 1995-10-12 1998-02-24 Weatherford U.S., Inc. Starting mill and operations
US5709265A (en) * 1995-12-11 1998-01-20 Weatherford/Lamb, Inc. Wellbore window formation
US6024169A (en) * 1995-12-11 2000-02-15 Weatherford/Lamb, Inc. Method for window formation in wellbore tubulars
US5636692A (en) * 1995-12-11 1997-06-10 Weatherford Enterra U.S., Inc. Casing window formation
US5727629A (en) * 1996-01-24 1998-03-17 Weatherford/Lamb, Inc. Wellbore milling guide and method
US6024168A (en) * 1996-01-24 2000-02-15 Weatherford/Lamb, Inc. Wellborne mills & methods
US5769166A (en) * 1996-01-24 1998-06-23 Weatherford/Lamb, Inc. Wellbore window milling method
US5803176A (en) * 1996-01-24 1998-09-08 Weatherford/Lamb, Inc. Sidetracking operations
US6766859B2 (en) 1996-05-02 2004-07-27 Weatherford/Lamb, Inc. Wellbore liner system
US6070665A (en) * 1996-05-02 2000-06-06 Weatherford/Lamb, Inc. Wellbore milling
US6155349A (en) * 1996-05-02 2000-12-05 Weatherford/Lamb, Inc. Flexible wellbore mill
US20030075334A1 (en) * 1996-05-02 2003-04-24 Weatherford Lamb, Inc. Wellbore liner system
US6547006B1 (en) 1996-05-02 2003-04-15 Weatherford/Lamb, Inc. Wellbore liner system
US7025144B2 (en) 1996-05-02 2006-04-11 Weatherford/Lamb, Inc. Wellbore liner system
US5829524A (en) * 1996-05-07 1998-11-03 Baker Hughes Incorporated High pressure casing patch
US5735359A (en) * 1996-06-10 1998-04-07 Weatherford/Lamb, Inc. Wellbore cutting tool
US6059037A (en) * 1996-07-15 2000-05-09 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US5813465A (en) * 1996-07-15 1998-09-29 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US5833003A (en) * 1996-07-15 1998-11-10 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US6076602A (en) * 1996-07-15 2000-06-20 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US6092601A (en) * 1996-07-15 2000-07-25 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US6116344A (en) * 1996-07-15 2000-09-12 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US6135206A (en) * 1996-07-15 2000-10-24 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US5862862A (en) * 1996-07-15 1999-01-26 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US5730221A (en) * 1996-07-15 1998-03-24 Halliburton Energy Services, Inc Methods of completing a subterranean well
US6029748A (en) * 1997-10-03 2000-02-29 Baker Hughes Incorporated Method and apparatus for top to bottom expansion of tubulars
US6021850A (en) * 1997-10-03 2000-02-08 Baker Hughes Incorporated Downhole pipe expansion apparatus and method
US6032740A (en) * 1998-01-23 2000-03-07 Weatherford/Lamb, Inc. Hook mill systems
US6073692A (en) * 1998-03-27 2000-06-13 Baker Hughes Incorporated Expanding mandrel inflatable packer
US6374918B2 (en) 1999-05-14 2002-04-23 Weatherford/Lamb, Inc. In-tubing wellbore sidetracking operations
US6446724B2 (en) 1999-05-20 2002-09-10 Baker Hughes Incorporated Hanging liners by pipe expansion
US6561271B2 (en) 1999-05-20 2003-05-13 Baker Hughes Incorporated Hanging liners by pipe expansion
US6598677B1 (en) 1999-05-20 2003-07-29 Baker Hughes Incorporated Hanging liners by pipe expansion
US6631765B2 (en) 1999-05-20 2003-10-14 Baker Hughes Incorporated Hanging liners by pipe expansion
US20040016545A1 (en) * 1999-05-20 2004-01-29 Baugh John L. Hanging liners by pipe expansion
US6915852B2 (en) 1999-05-20 2005-07-12 Baker Hughes Incorporated Hanging liners by pipe expansion
US20110031035A1 (en) * 2009-08-07 2011-02-10 Stowe Ii Calvin J Cutter and Cutting Tool Incorporating the Same
US8689911B2 (en) 2009-08-07 2014-04-08 Baker Hughes Incorporated Cutter and cutting tool incorporating the same
US8327957B2 (en) 2010-06-24 2012-12-11 Baker Hughes Incorporated Downhole cutting tool having center beveled mill blade
US8434572B2 (en) 2010-06-24 2013-05-07 Baker Hughes Incorporated Cutting elements for downhole cutting tools
US8936109B2 (en) 2010-06-24 2015-01-20 Baker Hughes Incorporated Cutting elements for cutting tools
US8602698B2 (en) * 2010-08-25 2013-12-10 Kennametal Inc. Combination end milling/drilling/reaming cutting tool
US20120051863A1 (en) * 2010-08-25 2012-03-01 Kennametal Inc. Combination end milling/drilling/reaming cutting tool
US8985246B2 (en) 2010-09-28 2015-03-24 Baker Hughes Incorporated Subterranean cutting tool structure tailored to intended use
US8555955B2 (en) 2010-12-21 2013-10-15 Baker Hughes Incorporated One trip multiple string section milling of subterranean tubulars
US9151120B2 (en) 2012-06-04 2015-10-06 Baker Hughes Incorporated Face stabilized downhole cutting tool
WO2015094659A1 (fr) * 2013-12-16 2015-06-25 Schlumberger Canada Limited Éléments de coupe pour fraisage de cuvelage
US20230182218A1 (en) * 2020-06-22 2023-06-15 Sumitomo Electric Hardmetal Corp. Cutting tool
US12186815B2 (en) * 2020-06-22 2025-01-07 Sumitomo Electric Hardmetal Corp. Cutting tool
CN113305524A (zh) * 2021-06-22 2021-08-27 锐胜精机（深圳）有限公司 刀具及其制作方法
CN115582675A (zh) * 2022-09-28 2023-01-10 沈阳黎明航空零部件制造有限公司 一种作动筒后盖内腔的加工方法

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GB2184963A (en) 1987-07-08
EP0231989A3 (fr) 1988-11-30
EP0231989A2 (fr) 1987-08-12
AU590374B2 (en) 1989-11-02
CA1325545C (fr) 1993-12-28
NO870032D0 (no) 1987-01-05
NO870032L (no) 1987-07-07
GB8614488D0 (en) 1986-07-16
SG81090G (en) 1990-11-23
NO177197B (no) 1995-04-24
GB2184963B (en) 1990-06-20
AU6712687A (en) 1987-07-09

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